Acecap 75-Pack Systemic Insecticide Tree Implants for Control of Tree Pests, 3/8-Inch https://www.amazon.com/dp/B00AZO7G7G/ref=cm_sw_r_cp_api_i_Blg7CbK5RZ94J
This?
For borers,systemic insecticide: https://www.amazon.com/dp/B00AZO7G7G/ref=cm_sw_em_r_mt_dp_96VP367J048J9W1DQWS1. Took me two years. Bayer makes a pourable one too